Abstract
Aiming to resolve the limitations of robustness and stability in switching working modes of dual redundancy electric servo system, a control strategy based on sliding mode control is suggested. By analyzing the electromechanical servo system’s basic structure and working theory, a mathematical model is created to enable the design of new control functions. Taking into account the influence of the internal parameter perturbation of the electromechanical servo system during the switching between working modes, the sliding mode control is used to enhance system robustness, and the method of combining the latest saturation function and the exponential reaching law is used to minimize the system chattering. The simulation results and analysis show that the control strategy can effectively improve the robustness and control accuracy of the system.
Highlights
In the past decade, redundant technology has become a key technology for the aerospace sector because of its high reliability
This paper focuses on the stability issue of the dual-motor differential electromechanical servo system during the switching of operating modes, and introduces speed loop sliding mode control using PID three-loop control
The sliding mode controller is replaced with an arctangent feature, reducing the chattering caused by the controller's motion
Summary
Redundant technology has become a key technology for the aerospace sector because of its high reliability. Compared with single-channel servos, the dual-channel design consists of two motors which in the active-active working mode can effectively use resources, the redundant design greatly improves the reliability of the system. With the sliding mode configuration, the device is insensitive to the change in the control parameters and has tremendous robustness. Sliding mode variable structure control triggers system chattering, and researchers have suggested some solutions:. The sliding-mode variable structure control is applied to a dual-motor differential electromechanical servo system to boost responses and facilitate homogeneity. In addition to the traditional PID control technique, an air rudder deflection output and motor speed curve were evaluated and the overshoot was decreased, the response time was quicker, and the system was more robust. The verification of results confirms the validity of the study and its results
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